How long will an EcoFlow DELTA Pro Ultra run a gas furnace?
About 14 hours — 13 h 44 min typically, from 12 h 56 min in the worst case to 14 h 33 min at best. That assumes a gas furnace pulling 600 W for 50% of the time (average 300 W), plus the station's 25 W AC mains socket overhead — 325 W in total out of 4,465 usable watt-hours.
The gas makes the heat, but the blower that pushes warm air through the ducts is a real motor with a real start-up surge — far more than a British combi boiler. Variable-speed (ECM) blowers usually draw less.
Before you rely on it
A furnace blower is a real motor with a start-up surge, and most furnaces are hard-wired with no plug. Some will not light on a station's floating output because they sense the flame through ground. The furnace guide explains all three problems and the safe way to connect one.
The numbers
| Setup | Average draw | Cautious | Typical | Best case |
|---|---|---|---|---|
| 1 × gas furnace, UK 230 V | 325 W | 12 h 56 min | 13 h 44 min | 14 h 33 min |
| 2 × gas furnace, UK 230 V | 625 W | 6 h 43 min | 7 h 8 min | 7 h 34 min |
| 1 × gas furnace, US 120 V | 325 W | 12 h 56 min | 13 h 44 min | 14 h 33 min |
- 1.7 nights of eight hours, or 0.57 days of continuous running.
- Usable energy: 4,465 Wh of the 6,144 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 10,733 Wh of rated capacity — 1.7× this station.
- Start-up: the gas furnace asks for 1,500 W at switch-on against this station's 11,200 W (230 V) / 14,400 W (120 V) peak — comfortable.
Buy the EcoFlow DELTA Pro Ultra
Where to buy
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If this is for a power cut
Heating is what a battery does worst. In a power cut, warming people rather than rooms goes much further, and none of this needs a socket.
Without a power station: a 20,000 mAh power bank runs a USB heated throw for about 7 h 24 min. See the power bank numbers.
Hot water bottle and a vacuum flask. Boil water while you still can, keep it hot in a flask, and refill the bottle through the night.
Look for: A bottle made to BS 1970 in the UK, and a flask of a litre or more.
Hand warmers. Air-activated packs give hours of heat with no power at all, and a pocketful helps children and older relatives.
Look for: Long-duration packs, and the expiry date on bulk boxes.
Amazon links are affiliate searches for a type of product, not endorsements of a model; the site may earn a commission at no extra cost to you.
More: How to keep warm in a power cut, and the power cut essentials list (US edition).
What changes the answer
| If instead… | Typical runtime | Change |
|---|---|---|
| The pack is two years old | 12 h 38 min | -8% |
| The pack is five years old | 10 h 59 min | -20% |
| It is −10 °C outside | 11 h 41 min | -15% |
| You run it flat, no reserve | 15 h 16 min | +11% |
| You keep 20% back | 12 h 13 min | -11% |
If you need it to run longer
Nothing in this catalogue runs a gas furnace for twice as long as the EcoFlow DELTA Pro Ultra. Either it is already near the top of the range, or this appliance is beyond what portable batteries do well — see the gas furnace page for the full ranking.
Smaller options that still work
| Station | Wh | Typical | Weight | Indicative price |
|---|---|---|---|---|
| Jackery Explorer 5000 Plus | 5,040 | 11 h 31 min | 61 kg | — / $3,499 |
| Zendure SuperBase V4600 | 4,608 | 10 h 28 min | 53 kg | £2,999 / $4,999 |
| EcoFlow DELTA Pro 3 | 4,096 | 9 h 18 min | 51.5 kg | £2,799 / $3,199 |
| Goal Zero Yeti PRO 4000 | 3,993 | 9 h 8 min | 52.5 kg | — / $4,000 |
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